RU1797731C - Multichannel power supply source - Google Patents

Abstract

Usage: power supply of high power facilities with stringent requirements for output voltage quality and reliability. The source is made in the form of several simultaneously operating voltage converters and regulators connected to them. Design of a voltage converter in the form of a push-pull transistor oscillator voltage feedback, including a series-connected resistor and a saturation inductor shunted by the winding of the oscillator control transformer, galvanically isolated from other transformer windings, and the placement of saturation inductor windings in the feedback circuits along the voltage of the primary converters on the common core synchronous common-mode switching of primary transistors without the introduction of additional stabilizing elements. 1 ill. ,

Description

The invention relates to electrical engineering and can be used to power high-power objects, which impose rather stringent requirements on the quality of the output voltage and the reliability of operation.

A power source is known, comprising two transistor inverters, each of which is connected to a common load through its own power transformer and rectifier. One of the converters is made by the master, the other by the slave. To this end, the slave control system is connected through a phase regulator to the master control system. The node is compared between the load and the phase regulator.

This solution is quite complicated and the presence of a phase shift in the switching of the transistors of the master and slave converters leads to an increased level of electromagnetic interference. In addition, the failure of the master converter control system leads to the cessation of others, which reduces the reliability of the power source. A power source is also known that contains N primary converters, each of which is controlled by its own task3

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generator. The master oscillator is a low-power transistor inverter according to the circuit with an average point and a saturable control saturation transformer. In the control transformer, synchronization windings connected in parallel through the windings of saturation chokes are placed. Saturation chokes are used to protect against re- failure; neration of master oscillators during short circuit x .;

Reliable operation of this source is guaranteed by its considerable complication. In addition, the synchronization of the frequency of the output voltage of the primary converters is not provided to the full extent, since even with synchronized master oscillators, the spread in the parameters of the elements of the primary converters will lead to an imbalance in the frequency of their output voltage,

In the proposed power supply, which contains N identical frequency-synchronized voltage converters and regulators installed at the output of the converters, each primary converter is made in the form of a push-pull transistor oscillator with voltage feedback, including a resistor connected in series and shunted by a choke saturation winding transformer control generator, electrically unconnected with other windings of this transformer, and the windings of chokes the saturations in the feedback loops along the voltage of all the primary converters are located on a common core.

It is known; that the simultaneous operation of any converters provides: an increase in the power source, however, additional synchronization elements are necessary, without which one of the known solutions does not provide high-quality operation of the source,

In the case of the simultaneous operation of several such converters when performing windings of saturable chokes in the feedback circuits by voltage on the common core, better synchronization is achieved in frequency and phase of the output voltages of the primary converters than in the known power source, and without introducing additional synchronization elements, At the same time high reliability of the source is ensured, since failure of any of the oscillators does not affect the operation of the others,

The drawing shows a schematic diagram of a power source.

The power supply contains N primary converters 1 and N stabilizers 1 ,. voltage converters installed at the output. Each of the converters 1 is made in the form of a push-pull oscillator on power transistors 3, 4, Shunt diodes 5-8

0 -included on the bridge circuit. The DC diagonal of the bridge is connected by cathodes to the terminal .-) -, by anodes to the terminal - power supply. The primary winding 9 of the output is included in the diagonal of the alternating current.

5 transformer transformers. Adjacent diodes 5, 6 through a common current feedback winding 10 are connected in parallel, respectively, to the collector-emitter junction of transistors 3 A. Adjacent diodes

0 7.8 connected in parallel to the locking capacitors 11,12. The base transistor circuit 3 (4) is formed by the winding 13 (14) of the control transistor of the transformer and the diode 15 (16), shunting the capacitor 17 (18), while the diode 15 (16) is connected to the base by a cathode. In parallel with the collector-base of transistor 3 (collector-base of transistor 4), a resistor 19 (20) is connected. Parallel to the emitter-base transition

0 of transistor 3 (emitter-base of transistor 4), a circuit is connected from series-connected capacitor 21 {22} and resistor 23 (24), Stabilizer 2 is connected to the secondary winding 25 of the output transformer. The outputs of stabilizer 2 are connected to the terminals for connecting the load. The voltage feedback loop is formed by a winding 26 of the output transformer connected in series with a resistor

0 27 and a saturation inductor shunting the winding 29 of the control transformer 28. The saturating windings of the saturation choke 28 of all the primary converters are located on a common core,

5 The self-oscillator is started by supply voltage via resistor 19 (20). In this case, one of the transistors 3 (4) is opened first and current flows through the winding 9 of the output transformer and the feedback winding 10. The flow of current through the winding 9 leads to the appearance of an EMF on the voltage feedback winding 26. This voltage through the resistor 27 is applied parallel to the 5 winding 29 of the control transformer and the saturation inductor 28. When this happens, the magnetization reversal drossel 28 in the mode of the current source on the full hysteresis loop. The magnetization reversal rate of saturation choke 28 is limited

voltage drop across the base diode and the emitter-base junction of the transistor. The saturation moment will be determined by the diode and transistor, the voltage drop at which is greatest. When saturating the throttle 28, the resistance of its winding drops sharply, which leads to a mode close to a short circuit in the circuit of the windings 29 of the control transformer, while the magnetization reversal speed of the cores of the control transformers sharply slows down, causing in their windings an effect equivalent to saturation of the core, which ensures synchronization of

mutations of transistors 3, 4 of all primary converters. The current feedback maintains a constant gain of the transistors over the entire range of the load current. For active locking of transistors 3,4, capacitors 11, 12 are used.

It is possible to perform a push-pull transistor oscillator according to a mid-point circuit, where each transistor has its own current coupling winding and a common diode in the base circuits, which is connected to the base of the transistor by the cathode through the base winding of the control transformer.

Formula A multi-channel power supply containing N. Identical frequency-synchronized voltage converters, to the output of which are connected regulators, characterized in that each primary converter is made in the form of a push-pull a voltage-feedback transistor oscillator comprising a series-connected resistor and a shunt throttle winding of the oscillator control transformer winding, the windings of saturation chokes in the feedback loops voltages are located on a common core.